Research on airplanes engines dynamic processes with modern acoustic methods for fast and accurate diagnostics and safety improvement

Abstract

The issues of monitoring the processes of combustion and fuel injection in a turbojet engine of a multi-purpose aircraft in real conditions of its use with the use of selected characteristics and measures of acoustic signal processes have been described in the paper. The aim is early detection of sources and parametric assessment of the intensity of negative changes in the above-mentioned main processes and in the components of the aircraft propulsion system, taking into account contemporary criteria for improving the safety of the implementation of the aviation task. Appropriate functional relations have been built for acoustic characteristics that are a response to specific sources of changes in the creation of a combustible mixture and its combustion process, which can be used in their continuous diagnostics, in accordance with the criteria of the highest operational efficiency of the thermodynamic and mechatronic system, including ensuring safety improvement. Operational indicators of the highest sensitivity for both processes have been linked to the particular acoustic impulse and energy parameters and frequency spectra, for which specified energy quantum is transferred by means of vibrating particles. The results demonstrate the proposed method assures early and accurate diagnostics for engine dynamic characteristics. The built procedures for combustion and injection projections in the acoustic discrete and continuous representations, both in process value and frequency domains, make the obtained findings valid for on-board fault-diagnosis system building.